Vows We Never Made: A Grumpy Sunshine Romance (The Blackthorn Inheritance Book 1)

Vows We Never Made: A Grumpy Sunshine Romance (The Blackthorn Inheritance Book 1)

by Nicole Snow

4.2 (9,779)

4.2 stars from 9,779 reviews. One of the highest rated Contemporary Fiction books we track.


$0.99KU80% off peak

Last checked: Jun 21, 2026

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Fans of these authors will like this...

  • Colleen Hoover
  • Emily Henry
  • Sally Thorne

Fans of these books will like this...

  • The Hating Game
  • It Ends with Us
  • Beach Read

Perfect for you if...

  • You love grumpy-sunshine dynamics where the cold guy melts unexpectedly and proves he's worth the emotional chaos.
  • You're drawn to marriage-of-convenience plots with real chemistry, especially when forced proximity becomes genuine connection.
  • You want a romance with high stakes (billionaire drama, family secrets, a bookstore dream) that doesn't take itself too seriously.

Maybe not for you if...

  • You prefer slow burns where the tension builds for 400 pages. This one moves fast and gets steamy early.
  • You're looking for standalone heroines. She's defined partly by her best friend and her dynamic with Ethan's world.
  • You dislike possessive hero behaviour. Ethan gets jealous and controlling, which is played as sexy rather than critiqued.

About this book

A cheerful bookworm's life changes when her best friend's older brother, billionaire Ethan Blackthorn, proposes to her. According to his grandfather's will, Ethan must marry for six months to inherit, and he offers her a substantial payment, her dream bookstore, and an escape from reality in exchange for playing along as his fiancée. However, Ethan begins treating the arrangement seriously. He kisses her with apparent meaning, becomes protective when other men show interest, and reveals a side of himself that contradicts his reputation as a cold, cruel businessman. His secrets and intense focus on her confuse her, especially since the man who once upset her now seems to live for her happiness. As the line between their fake engagement and genuine feelings blurs, she struggles to understand what is real and whether she can move forward when their temporary vows begin to feel permanent. This standalone romance features a grumpy-sunshine dynamic, a best friend's brother relationship, and a marriage of convenience.

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Price History

Kindle price over time. Green zones = periods when the book was free.

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Free$2.50$4.99Aug '25Jan '26Jan '26Jun '26
$0.99$4.99

Currently on sale at $0.99 — 80% off peak. Price has dropped 2 times over the last 10 months. Goes on sale roughly every 157 days.

Sales Rank

Amazon sales rank: lower number = better selling book. #1 is the bestseller.

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#17#1,728#3,439Aug '25Nov '25Feb '26Jun '26

Currently #869 in the Kindle store — a top-1,000 bestseller.

Rating & Reviews

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3.5★4.3★5.0★Aug '25Oct '25Nov '25May '26RatingReviews

Currently 4.2★ from 9,779 reviews

Gaining approximately 1,070 new reviews per month. Reader interest is surging. Rating has dipped slightly from 4.8 to 4.2.

Sale Prediction

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Free$2.50$4.99Aug '25Jan '26Jan '26Jun '26PredictedJun '26

Actual Predicted

This book is currently discounted at $0.99. It typically returns to around $4.99.

Prices shown in USD from Amazon US. We continuously pull new data to improve tracking. If dates look old, it usually means there has been no significant change since the last data point.

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Nicole Snow

1 book on Vagrant Press

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